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Title: Accelerated Stress Testing of Fuel Cell Membranes Subjected to Combined Mechanical/Chemical Stressors and Cerium Migration

Abstract

A highly accelerated stress test (HAST) has been developed to generate local stressful conditions that are representative of those in automotive fuel cell stacks. Using a 50-cm 2 cell cycled between 0.05 and 1.2 A/cm 2 with a low inlet RH in the co-flow configuration, the HAST creates a distribution of combined mechanical/chemical stressors in the membrane with the maximum chemical stress occurring near the gas inlets and the maximum mechanical stress near the outlets. Conducting HASTs using a current distribution measurement tool and a shorting/crossover diagnostic method to track the state of health of a robust membrane containing both a mechanical support and a chemical stabilizing additive, the result shows that the membrane location with the most severe thinning coincides with that of the deepest membrane hydration cycling. Upon examination of the cerium redistribution patterns after the test, it was found that the severe humidity cycling generated by the HAST condition near the outlet region not only generated the highest membrane mechanical stress but also resulted in the strongest water flux, which may cause local depletion of the cerium added as chemical stabilizer. Further study is required to decouple the cerium migration effect from the possible mechanical/chemical synergistic degradationmore » effect.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. General Motors Corp., Pontiac, MI (United States)
Publication Date:
Research Org.:
General Motors Corp., Pontiac, MI (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1509879
Grant/Contract Number:  
EE0007651
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 165; Journal Issue: 6; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; durability; PEM fuel; cell proton exchange membrane

Citation Formats

Lai, Yeh-Hung, Rahmoeller, Kenneth M., Hurst, James H., Kukreja, Ratandeep S., Atwan, Mohammed, Maslyn, Andrew J., and Gittleman, Craig S. Accelerated Stress Testing of Fuel Cell Membranes Subjected to Combined Mechanical/Chemical Stressors and Cerium Migration. United States: N. p., 2018. Web. doi:10.1149/2.0241806jes.
Lai, Yeh-Hung, Rahmoeller, Kenneth M., Hurst, James H., Kukreja, Ratandeep S., Atwan, Mohammed, Maslyn, Andrew J., & Gittleman, Craig S. Accelerated Stress Testing of Fuel Cell Membranes Subjected to Combined Mechanical/Chemical Stressors and Cerium Migration. United States. doi:10.1149/2.0241806jes.
Lai, Yeh-Hung, Rahmoeller, Kenneth M., Hurst, James H., Kukreja, Ratandeep S., Atwan, Mohammed, Maslyn, Andrew J., and Gittleman, Craig S. Tue . "Accelerated Stress Testing of Fuel Cell Membranes Subjected to Combined Mechanical/Chemical Stressors and Cerium Migration". United States. doi:10.1149/2.0241806jes. https://www.osti.gov/servlets/purl/1509879.
@article{osti_1509879,
title = {Accelerated Stress Testing of Fuel Cell Membranes Subjected to Combined Mechanical/Chemical Stressors and Cerium Migration},
author = {Lai, Yeh-Hung and Rahmoeller, Kenneth M. and Hurst, James H. and Kukreja, Ratandeep S. and Atwan, Mohammed and Maslyn, Andrew J. and Gittleman, Craig S.},
abstractNote = {A highly accelerated stress test (HAST) has been developed to generate local stressful conditions that are representative of those in automotive fuel cell stacks. Using a 50-cm2 cell cycled between 0.05 and 1.2 A/cm2 with a low inlet RH in the co-flow configuration, the HAST creates a distribution of combined mechanical/chemical stressors in the membrane with the maximum chemical stress occurring near the gas inlets and the maximum mechanical stress near the outlets. Conducting HASTs using a current distribution measurement tool and a shorting/crossover diagnostic method to track the state of health of a robust membrane containing both a mechanical support and a chemical stabilizing additive, the result shows that the membrane location with the most severe thinning coincides with that of the deepest membrane hydration cycling. Upon examination of the cerium redistribution patterns after the test, it was found that the severe humidity cycling generated by the HAST condition near the outlet region not only generated the highest membrane mechanical stress but also resulted in the strongest water flux, which may cause local depletion of the cerium added as chemical stabilizer. Further study is required to decouple the cerium migration effect from the possible mechanical/chemical synergistic degradation effect.},
doi = {10.1149/2.0241806jes},
journal = {Journal of the Electrochemical Society},
number = 6,
volume = 165,
place = {United States},
year = {2018},
month = {3}
}

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Cited by: 5 works
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